//弹出框拖动功能 自定义指令
const dialogDrag = (app) => {
    app.directive('dialogdrag', {
        mounted(el, binding, vnode, oldVnode) {
            const dialogHeaderEl = el.querySelector(".el-dialog__header");
            const dragDom = el.querySelector(".el-dialog");
            dialogHeaderEl.style.cursor = "move";

            // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
            const sty =
                dragDom.currentStyle || window.getComputedStyle(dragDom, null);

            dialogHeaderEl.onmousedown = (e) => {
                // 鼠标按下，计算当前元素距离可视区的距离
                const disX = e.clientX - dialogHeaderEl.offsetLeft;
                const disY = e.clientY - dialogHeaderEl.offsetTop;

                // 获取到的值带px 正则匹配替换
                let styL, styT;

                // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
                if (sty.left.includes("%")) {
                    styL =
                        +document.body.clientWidth * (+sty.left.replace(/\%/g, "") / 100);
                    styT =
                        +document.body.clientHeight * (+sty.top.replace(/\%/g, "") / 100);
                } else {
                    styL = +sty.left.replace(/\px/g, "");
                    styT = +sty.top.replace(/\px/g, "");
                }

                document.onmousemove = function (e) {
                    // 通过事件委托，计算移动的距离
                    const l = e.clientX - disX;
                    const t = e.clientY - disY;

                    // 移动当前元素
                    dragDom.style.left = `${l + styL}px`;
                    dragDom.style.top = `${t + styT}px`;

                    // 将此时的位置传出去
                    // binding.value({x:e.pageX,y:e.pageY})
                };

                document.onmouseup = function (e) {
                    document.onmousemove = null;
                    document.onmouseup = null;
                };
            };
        },
    })
}

export default dialogDrag